Non-breakable safety lamp-glass.



E. 0. MOLAUGHLIN. NON-BREAKABLE SAFETY LAMP GLASS.

APPLIOATION FILED D120. 20, 1912.

1,072,021. Patentd Sept. 2, 1913.

anon wow UNITED STATES PATENT OFFICE.

EDWARD OSKEB MGLLUGHLIN, 01' MASONTOWN, PENNSYLVANIA.

NOH B DEAKABLE LAMP-GLASS.

Specification of Letters Patent.

Patented Sept. a, 1913.

Application and December 20, 191a Serial No. 737,915.

and it has for its object the provision of ametallic conductor forming a permanent part of the chimne and primarily designed to prevent the sud en absorption of the heat bythe walls of the chimney and the radiation of the heat to the external surfaces of the chimney whereby the heat will be gradually collected by the conductor and distributed to'the external surfaces of the chimney in such manner as will prevent breakage of the chimney under expansion, and further the provision offa conductor which will serve to reinforce or strengthen the chimney to prevent breakage thereof under ordinary handling. 7

A further object of the invention is to provide a chimney wherein the metallic conductor thereof will embod an element having internalpartly expose convolutions, external part1 exposed convolutions and internal wholly embedded convolutions, the latter serving the purpose of a main strengthening element, while the exposed convolutions are relatively associated whereby to immediately conduct the heat from a particular interior portion of the chimney to an immediate exterior portion thereof.

With these and other objects in view, the invention consists of certain novel features of construction, combination and arrangement of parts, as will be hereinafter described and claimed.

In the accompanying drawings: Figure 1 is a vertical section through a portion of the chimney, showing the. application of the invention thereto; Fig. 2 is a similar view, showing a slightly modified form of the invention; Fig. 3 is a section on line 3--3 of Fig. 1; and Fig. 4 is a side view of the chimney, showing another 'modification thereof.

The chimney 1 as shown in Figs. 1 and 3 of the drawings, is substantially of oval configuration whereby to maximize the light permeating surface thereof. The metallic conductor of the chimney is preferably constructed from a single length of wire having innermost windings 2, which are partly embedded in the glass whereby surfaces 3 of said windings project into the flame space of the chimney and immediately on the inner walls thereof. Similar outermost windings 4 are also partly embedded in the glass and as illustrated portions 5 of the latter windings are exposed exteriorly of the walls of the chimney while they are connected with the internal absorbing sur faces 3 and wholly embedded windings 6 of the wire, the latter serving to strengthen or reinforce the walls of the chimney both longitudinally and laterally whereby to prevent breakage thereof under ordinary handling. The surfaces 3 and 5 of the windings 2 and 4, respectively, also serve to strengthen the chimney longitudinally and laterally but they are primarily intended to prevent the sudden radiation of the heat through the walls of the chimney to prevent any sudden expansion of the g ass. The surfaces 3 of the innermost windings 2 are preferably equi-distantly arranged while they are relatively associated with the outermost windin 4 whereby on the sudden application 0 heat to a particular portion of the chimney, immediate point of application of the heat will serve to absorb the latter and then gradually conduct the same to the adjacent external surfaces 5 of the windings 4.

In the modified form of the invention shown in Fig. 2, the chimney 7 is substan tially of the same configuration as the one described in the preferred embodiment of the invention, the difi'erences being in the rovision of a metallic conductor 8, which 1s wholly embedded in the walls of the chimney. The conductor 8 is provided with circumferential windings 9 and longitudinal bowed connecting strands, 10.

In the modified form of the invention shown in Fig. 4, the chimney 11 is provide with a conductor and reinforcing element 12 of suitablewire cloth having relatively large meshes 13, as shown.

From the foregoing description, taken in connection with the accompanying drawings, the construction and operation of the invention will be readily understood without requiring a more extended explanation.

Various changes in the form, proportion and the minor details of construction may the surface 3 at the' 9% i inmost be resorted to without departing from the connectingthe first andsecond named windprinciple or sacrificing any of the ndvnnings together and embedded in the walls of ta, es of this invention, as claimed. 7 the chimney. V

' eving thus descrlbed my invention, whet In imony whereof I eflix my signature I 5 I claim 1s in presenoecof two wimesses.

A lamp chimney Having a. metallic heat conductor and provided with internal con- 4 ducting windings exposm to the dome spece Wimwes: 4 of the chimney, external windings exposed E. K. Wm, 10 to the atmosphere, end internel windings WM... Molliewomm.

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